I'm using XFree4/KDE2 under Mandrake 7.2 with an ATI Mach64 video card and a Hitachi CM751 monitor. When I enable DPMS, the monitor blanks for a few seconds after the timeout period set with xset, but then an "INVALID SCAN FREQ." message appears from the monitor and the screen shows a random, garbled video signal. Pressing any key brings the desktop back. In the BIOS (ABIT BH6 rev. 1.1) I have ACPI disabled and APM enabled. I've tried Video Off Methods: "DPMS", "Blank Screen", "V&H Sync + Blank Screen" respectively; nothing fixes the problem. I've also tried disabling APM and BIOS-level power management functions respectively. At first I thought this worked, but eventually the monitor entered the same errant state. Additionally, I tried installing the apmd package from Mandrake 7.2 install ISO and turning back on APM in the BIOS. Still getting the "INVALID SCAN FREQ" message accompanied by a garbled video signal in standby. Any suggestions on how to get the screen to stay blank during standby? I'd be interested also in any pointers to general references on power management under Mandrake that might exist. Thanks.
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